Docs for defining an ondemand run pipeline but that maintains the pipeline variables.

It's not uncommon that there is some exploration of what the necessary parameters are for a pipeline, eg. which VMF_ vars to set and what values they should have. It also might be desirable to have a few types to choose from, eg. one with an VMF_IMAGE for an alma and one for an ubuntu image.

Is there a way to define pipelines so that the variables are preserved run-to-run and can potentially be edited. Is this a scheduled pipeline? If so is there a way to invoke a scheduled pipeline on demand?

Basically I'm looking for a way to avoid having to specify a bunch of pipeline variables each time i run a pipeline ad hoc.